| 摘要 |
A growth factor containing serum derived from natural bovine serum by precipitating a first solids fraction from natural bovine serum by adding ammonium sulfate to about 25% saturation to give a first solids fraction and a first supernatant; separating said first solids fraction from said first supernatant; precipitating a second solids fractions from said first supernatant by adding ammonium sulfate to about 40% saturation to give a second solids fraction and a second supernatant; separating said second solids fraction from said second supernatant; combining said first solids fraction and said second supernatant; and desalinating said first solids fraction and said second supernatant, either before or after said combining. |
